<optgroup label="Northern">
	<option value="1">Trinity</option>
	<option value="2">Modoc</option>
	<option value="3">Shasta</option>
</optgroup>
<optgroup label="Central">
	<option value="1">Santa Cruz</option>
	<option value="2">Santa Clara</option>
	<option value="3">Madera</option>
</optgroup>
